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Myung Ki Cheoun,Kyungsik Kim 한국물리학회 2007 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.50 No.4
We calculated the 2 decay for 96 40Zr56 ! 96 42Mo54 and the Gamow-Teller strength for 96 40Zr56 ! 96 41Nb55 and 96 42Mo54 ! 96 41Nb55 by using the quasi-particle random phase approximation (QRPA). Our QRPA includes all kinds of the nucleon pairing correlations (neutron-neutron, proton-proton, and neutron-proton), which are considered within the extended Bardeen-Cooper-Schrieffer (BCS) theory. The Brueckner reaction matrix is obtained from the Bonn potential through the Bethe- Goldstone equation. The results show reasonable behaviors with respect to the excitation energies.
Recent research activities of division of nuclear physics
Cheoun Myung-Ki 한국물리학회 2023 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.82 No.6
I review the recent development of research groups of the Division of Nuclear Physics (DNP) in the Korean Physical Society (KPS) during the 2000s for commemorating the 50 year history of the DNP in the KPS. Since detailed research activities in each feld of the DNP are introduced in other papers of this special issue, this review is focused on the main research groups, RISP (Rare Isotope Science Project) for the RAON accelerator, CENS (Center for Exotic Nuclear Studies) in the IBS (Institute of Basic Science) for the application of the RAON accelerator, CENuM (Center for Extreme Nuclear Matters) by the SRC (Scientifc Research Center) Program, OMEG (Origin of Matter and Evolution of Galaxy) Institute by the Key Research Center in Universities Program, and other international research activities.
Analyses of quasielastic scattering data for the 11Be +197Au system
허경수,Cheoun Myung-Ki,So W. Y.,최기석,Kim K. S. 한국물리학회 2021 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.79 No.1
Within the framework of an optical model, the quasielastic channel experimental data for the 11 Be + 197 Au system measured at energies below and around the Coulomb barrier are analyzed. For the analysis of the 11 Be + 197 Au system, we include Coulomb dipole excitations and long-range nuclear potential to account for a long-range effects of this halo nuclear system. Using the parameters obtained from χ2 analysis, we successfully reproduce the quasielastic experimental angular distributions for the 11 Be + 197 Au system.
Choi, Ki-Seok,Cheoun, Myung-Ki,So, W.Y.,Hagino, K.,Kim, K.S. North-Holland Pub. Co 2018 Physics letters. Section B Vol.780 No.-
<P><B>Abstract</B></P> <P>We discuss the role of two-neutron transfer processes in the fusion reaction of the <SUP>9,11</SUP>Li + <SUP>208</SUP>Pb systems. We first analyze the <SUP>9</SUP>Li + <SUP>208</SUP>Pb reaction by taking into account the coupling to the <SUP>7</SUP>Li + <SUP>210</SUP>Pb channel. To this end, we assume that two neutrons are directly transferred to a single effective channel in <SUP>210</SUP>Pb and solve the coupled-channels equations with the two channels. By adjusting the coupling strength and the effective <I>Q</I>-value, we successfully reproduce the experimental fusion cross sections for this system. We then analyze the <SUP>11</SUP>Li + <SUP>208</SUP>Pb reaction in a similar manner, that is, by taking into account three effective channels with <SUP>11</SUP>Li + <SUP>208</SUP>Pb, <SUP>9</SUP>Li + <SUP>210</SUP>Pb, and <SUP>7</SUP>Li + <SUP>212</SUP>Pb partitions. In order to take into account the halo structure of the <SUP>11</SUP>Li nucleus, we construct the potential between <SUP>11</SUP>Li and <SUP>208</SUP>Pb with a double folding procedure, while we employ a Woods–Saxon type potential with the global Akyüz–Winther parameters for the other channels. Our calculation indicates that the multiple two-neutron transfer process plays a crucial role in the <SUP>11</SUP>Li + <SUP>208</SUP>Pb fusion reaction at energies around the Coulomb barrier.</P>
Ha, Eunja,Cheoun, Myung-Ki American Physical Society 2016 Physical Review C Vol.94 No.5
<P>We investigate effects of neutron-proton (np) pairing correlations on the Gamow-Teller (GT) transition of Mg-24,Mg-26 by explicitly taking into account deformation effects. Our calculation is performed by a deformed quasiparticle random phase approximation (DQRPA) which includes the deformation at the Bardeen-Cooper-Schrieffer and RPA stage. In this paper, we include the np pairing as well as neutron-neutron (nn) and protonproton (pp) paring correlations to the DQRPA. Our new formalism is applied to the GT transition of well-known deformed Mg isotopes. The np pairing effect is found to affect more or less the GT distribution of Mg-24 and Mg-26. But the deformation effect turns out to be much larger than the np paring effect because the Fermi surfaces smear more widely by the deformation rather than the np pairing correlations. Correlations between the deformation and the np pairing effects and their ambiguities are also discussed with the comparison to experimental GT strength data by triton and He-3 beams.</P>